Adjustable light-holder.



R. DE 8. H. ANDERSON.

ADJUSTABLE LIGHT HOLDER. APPLICATION man JAN. 21. I918.

1,283,446,. Patented Nov; 5,1918,

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ROBERT DE SHIELDS HAMAN ANDERSON, OF PAWTUXET, RHODE ISLAND.

ADJUSTABLE LIGHT-HOLDER.

To all whom it may concern:

Be it known that I, ROBERT DE SHIELD HAMAN ANDERSON, a' citizen of the United States, residing at Pawtuxet, in the county of Providence and State. of .Rhode Island,

have invented a new and useful Improvement in Adjustable Light-Holders, of which the following is a specification.

My invention has reference to an improvement in electrical appliances and more particularly to an improvement in adjustable light holders adapted to be detachably sevcured to relatively fixed objects, such as beds, chairs, etc.

The object of my invention is to improve the construction of adjustable light holders for incandescent electric lights, such as shown in my United States Patent No. 1,077,663, issued to me Nov. 4, 1913, whereby the holder may be adjustably secured to an article of furniture and locked in the required position, for use in hotels and the like.

Further objects of my invention are to improve the means of wiring the fixture or method of wiring whereby the wires are car ried through the holder, telescopic means for lengthwise adjustment of the holder and details of construction, as-will be more fully set forth hereinafter and'claimed.

Figure 1 is a side view of my improved adjustable light holder showing intermediate portions broken away to more clearly illustrate my invention.

Fig. 2 is an enlarged longitudinal sectiona'l view of a portion of the holder showing the locking means, one of the twin disk joints and the upper portlon of the telescopic construction.

and

Fig.3 is an enlarged longitudinal view showing the lower portion ofthe telescopic construction in section.

Fig. 4 is an end view of the locking key,

Fig. 5 is a sectional view of the locking key taken on line 5, 5 of Fig. 4.

Specification of Letters Patent.

Patented Nov. 5, 1918.

' Application filed January 21, 1918." Serial No. 212,984.

In the drawing, 6 indicates my improved adjustable light holder, 7 the usual incan descent electric light socket on the outer end of the holder, 8 the usual light plug and 9 msulated electric light wires, two wires in one lnsulation.

The holder 6 is constructed to have a clamping and locking member 10, two twin hollow disk joints ll, 11 and a telescopic section 12. The clamping and locking mem-.

ber 10 consists of two bent gripping jaws 13 and 14. The jaw 13 has a curved bolt 15 fined 1n the jaw, a transverse groove 16, a wlre openlng l7 and is formed integral with one of the members of a disk joint 11. The aw 14 has a bolt hole 18, through which the bolt 15 extends, a comparatively deep cavity 19, a nut 20 in screw-thread engagement with the curved bolt 15 and engaging with the bottom of the cavity 19, and a half round transverse rib shaped end 21 which engaging with the groove 16 in the jaw 13 forms a hinge joint for the jaws, as shown in Figs. 1 and 2.

The twin disk joints 11, 11 are formed-at rlght angles to each other'and in two parts.

Each part of a disk joint 11 is constnuctedf to form one half of a circular chamber 22,

eachhalf of which is lined with an insulatlng material 23, 23. The two parts or halves of the disk joints are frictionally secured together by a central screw 24 and nut 25 and the screw 24 is covered in the chamber 22 by a sleeve 26 of insulating material. A wire opening 27 connects the twin disk joint members, as shown in Fig. 2.

The telescopic section 12 consists of a 7 tube 28 screwed at one end into a member of a dlsk olnt 11 and screw-threaded at its outer end 29. A friction adjusting collar 30 screws over the end-29 and carries two tapered senn-circularfriction plugs- 31, 31

' which friotionally engage with 'a tube 32 whlch telescopesthrough the collar 30 intothe tubet28, as shown in Fig. 3. A coiled wire 33, or its equivalent, is secured at one end to the inner end of the tube 28 and at its other end to the-inner end of the tube32, as shown in Figs. 2 and 3, thereby eliminating .friction'betweenthe electric wire coil and the tube 28.

The insulated electric light wires 9 are carried. from the plug 8 through the wire opening 17, ln WhlOh it is insulated by an insulating cementing material 34, into the chamber 22, then coiled around the screw 24 in the chamber 22 into a coil 39, then out through the wire opening 27 in which 1t is insulated by an insulating cementing material 34, into the next chamber 22. The wires are then coiled around the screw 24: into a coil 39 in this chamber and then carried out through a wire hole in the joint, in which 1t is insulated by an insulating cementing material 34: and into the end of the tube 28.

' bolt 15 and an end recess 38 shaped to fit over the nut 20, is used, by turning the nut 20 on the curved bolt 15, to fasten the clamping member 10 and to lock the holder on the object to which the holder is to be secured.

hen the key is removed the holder is locked, as it requires the key to turn the nut. This is necessary in hotels and similar places. For private use a winged nut may be used in place of the nut 20.

In my improved adjustable light holder, the light wires are now carried through and concealed in the holder, the coiling of the light wires in the disk joints allows perfect freedom of movement of the joints Without breaking or injuring the light wires. The forming of the light wires into a longitudinal coil 35 in the tube 28 allows perfect telescopic movement of the tube 32 in the tube 28 without injury to the light wires and the wire coil 33 prevents friction and wear on the coil of light wire against the inner surface of the tube 28, as the coiled wire 33 expands and contracts with the coil 35 of light wire, also the light wires 9 are insulated in the. disk joints from the holder by the insulating material 23, 23 lining the joints and the sleeve of insulating material on the joint screw and the holder as a whole may be as freely adjusted as the old form of holder having external wiring. By turning the friction adjusting member 30 to more or neeaeae less tighten the friction plugs 31, 31 on the tube 32 any friction desired on the tube 32, may be obtained, to hold the light in the required position.

Having thus described my invention I claim as new:

1. An adjustable light holder having an outer and an inner tube telescopically connected, a wire coil or its equivalent operatively connected at one end to the outer tube and at its other end to the inner tube, electric light wires extending through the tubes and formed into a coil inside of the Wire coil, an electric light socket on the outer end of the holder"and means on the inner end of the holder for locking the holder to a relatively fixed object.

2. An adjustable light holder having tubes operatively connected by friction joints formed in twoparts each part having a eavity, an electrical insulating material lining each cavity, .a bolt extending centrally through the joint and adpted to frictionally secure the parts of the joint together, an

electric insulating material covering said bolt in said cavities and electric light wires extending through the tubes and formed into coils around the bolt in the insulated cavities of the disk joints.

3. An adjustablelight holder having tubes operatively connected by friction joints having insulated cavities therein and inlet and outlet wire openings in the joints, electric light wires extending through the tubes and the wire openings in the joints and, formed into a coil in the joint cavities,said coil being adapted to expand and contract circumferentially in the joint cavities, and insulating I ings in the joints.

4. An adjustable light holder having tubes operatively connected by friction disk joints and telescopic connections, electric light -wires extending through the tubes and cementing material closing the wire opep- 

